Walk with your thumbs pointed forward. Why? To straighten your posture! When you twist your hands, and your thumbs point behind you, you begin to roll your shoulders and curve your back and you appear older than you are. Pointing your thumbs forward protects and preserves your posture, giving you a youthful appearance.
Living at your ideal body weight is probably the biggest anti-aging strategy for many reasons. Your ideal body weight is an individual decision; speak to a professional to help you determine what size is best for you.